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New 320 owner...? Part 3!

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DaveX View Drop Down
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Joined: 20 July 2021
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    Posted: 23 September 2021 at 18:50
Possibly a dumb question but here goes.... how may anodes does a 320 have, specifically is there a hull anode?

Asking as a survey I have suggests one is needed, and that seacocks and rudder post should be bonded. There is also vague talk of galvanic or stray current corrosion due to an electrical fault.

Certainly the rudder post (now replaced I think) was corroded as is the heads outlet seacock, but oddly none of the other seacocks appear corroded. 

I thought all boats had a hull anode.... but maybe this is where i am being dumb....
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Taylor View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Taylor Quote  Post ReplyReply Direct Link To This Post Posted: 24 September 2021 at 11:35
your surveyor is talking complete and absolute bollocks reference bonding. 

Your boat is plastic and providing all seacocks and rudder tubes are isolated they will not corrode due to electrolysis. 

They should never be bonded. 

Ensure that you do not have a coat of antifouling (usually copper based and a good conductor) anywhere near your metal through hulls or rudder tube or stock. Leave an unpainted zone as per Jeffa instructions.

Hull anodes are only useful for steel boats. 

The only sacreficial anodes to worry about will be fitted locally and either protect your saildrive leg, prop shaft gear or folding prop if fitted.

Sorry can't comment about your other post but I would definitely be getting someone with experience of hanse deck seal construction rather than take the evidence of your surveyor as gospel based on the fact that your surveyor knows sweet f a about bonding on Hanse's.


Hanse 301 Bluenote 11
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DaveX View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DaveX Quote  Post ReplyReply Direct Link To This Post Posted: 25 September 2021 at 10:21
Thanks. That section of the report is very vague and general, an extract from a  text book really and full of maybes including stray leakage from other boats and marina shore power causing corrosion. A bit like a weather forecast telling you its going to rain, but not where or when.
. Not something I'm worried about. I may get an electrician to test just from an electrical safety point of view and if that rules out vague talk of leaking current etc at the same time, great.

What i was getting at is, does the 320 have one of these?uploads/7211/anode.pdf

I think, from digging around the web, no, not on a 2008 build, so if it is designed and built without one i am not going to add one
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cptgood View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cptgood Quote  Post ReplyReply Direct Link To This Post Posted: 25 September 2021 at 11:26
Hi,
No anode on the hull.
I suggest you to install a galvanic isolator (Zinc Saver from Sterling for example)
Hanse320 - Hull#127/08 - Wheel - ST headsail - Yanmar 3YM30 - SD20
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andrewlambert View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote andrewlambert Quote  Post ReplyReply Direct Link To This Post Posted: 25 September 2021 at 14:56
agree with Taylor on Jeffa guidance thatís publically available on their site 
Hanse 370 #237 "Ginger Bay" UK, River Hamble
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Old Racer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Old Racer Quote  Post ReplyReply Direct Link To This Post Posted: 26 September 2021 at 11:31
Dave

I have an anode on the hull of our 320. It does not appear to be connected to anything and certainly shows no corrosion although over time the sail drive anode does corrode and gets changed.

I have recently due to some pitting present on the keel have had the bonding tested and it passed.

The recommendation to solve the pitting was to fit a galvanic isolator. This advice came from different sources. The electrical interference when in marinas can be caused by boats round about you and the fact that different marina's may have different earthing solutions.

We have now fitted one into our shore power lead. 


Hanse 320 Olicana Inverkip Scotland
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